A bearing preload pad measuring gauge and its measuring method

Abstract

The present invention relates to a measuring gauge for bearing preloading pads, which comprises a detection handle and a detection ring; a detection head is provided on the top surface of the detection ring, a dial base is provided on the outer circumference of the detection ring, and a detection head telescopic mechanism is provided inside the dial base; a dial indicator is inserted into the dial base, the dial indicator is fixed to the dial base through a locking bolt, the measuring head of the dial indicator contacts one end of the detection head telescopic mechanism, and the other end of the detection head telescopic mechanism is connected to the detection head; two tightening rollers are provided on the upper surface of the detection ring, a hand pressure plate is provided on the side surface of the detection handle, and a tightening roller telescopic mechanism is provided in the inner cavities of the detection handle and the detection ring, one end of the tightening roller telescopic mechanism is connected to the tightening roller, and the other end is connected to the hand pressure plate; three reference pins are evenly distributed in a circumferential manner on the lower surface of the detection ring. This measuring gauge is very compact in overall structure, easy to operate, with the working efficiency increased by more than 20 times and low cost, realizing the rapid and accurate detection of the thickness of preloading pads for NN series bearings.

Description

Technical Field

[0001] The present invention relates to a bearing preload pad measuring gauge, which is a mechanism for detecting the thickness of preload pads during the assembly of NN series bearings. Background Art

[0002] During the assembly of NN series bearings, when preloading the NN series bearings, it is necessary to detect the distance between the NN series bearings and the reference end face of the main shaft. Currently, the distance between the bearing end face and the reference end face of the main shaft is measured by the method of combining gauge blocks. Then, the gauge blocks are used to measure at three positions along the circumferential direction of the shaft diameter, and the average value is taken to measure the thickness of the preload pad of the NN series bearings. The method of combining gauge blocks is subject to the cumulative error caused by the number of gauge block combinations (generally 3 - 4 gauge blocks) and the measurement error generated during the three-point measurement process. There is a difference between the thickness of the preload pad ground according to the detection data and the actual required ground pad thickness, which has limitations. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a bearing preload pad measuring gauge, which is very compact in overall structure, easy to operate, has a working efficiency increased by more than 20 times and a low cost, and can quickly and accurately detect the thickness of the preload pad of the NN series bearings.

[0004] To solve the above problems, the specific technical solution of the present invention is as follows: A bearing preload pad measuring gauge includes a detection handle and a detection ring. The detection ring is semi-circular, and the detection handle is located at the central axis of the outer surface of the semi-circular ring. A detection head is provided on the top surface of the detection ring, and a dial base is provided on the outer circumference of the detection ring. A detection head telescopic mechanism is provided inside the dial base. A dial indicator is inserted into the dial base. The dial indicator is fixed to the dial base by a locking bolt. The measuring head of the dial indicator contacts one end of the detection head telescopic mechanism, and the other end of the detection head telescopic mechanism is connected to the detection head. Two tightening rollers are provided on the upper surface of the detection ring, and a hand pressure plate is provided on the side surface of the detection handle. A tightening roller telescopic mechanism is provided inside the cavity of the detection handle and the detection ring. One end of the tightening roller telescopic mechanism is connected to the tightening roller, and the other end is connected to the hand pressure plate. Three reference pins are evenly distributed in a circle on the lower surface of the detection ring.

[0005] The structure of the detection head telescoping mechanism is as follows: A lever seat is fixedly connected to the bottom of the inner cavity of the detection ring. The middle part of the detection lever located in the inner cavity of the detection ring is connected to the lever seat through a pin. One end of the detection lever is connected to the detection head through a pin, and the top of the detection head extends out from the upper surface of the detection ring. The other end of the detection lever is connected to a contact post through a pin, and the contact post is located in the vertical hole of the table seat. A floating handle that moves up and down is provided on the outer end face of the table seat. A horizontal threaded hole is provided on the contact post. After the floating handle passes through the vertical long hole provided on the outer end face of the table seat, it is connected to the threaded hole of the contact post. A spring cap is provided on the detection lever near the contact post. A compression spring is coaxially connected to the spring cap. The compression spring is located in the groove of the table seat and its bottom is supported on the spring cap, while the top of the compression spring is supported on the top surface of the groove. The measuring head of the dial indicator contacts the upper surface of the contact post.

[0006] The tightening roller telescoping mechanism consists of a loosening mechanism and a tightening mechanism. The structure of the loosening mechanism is as follows: Arc-shaped rods are symmetrically arranged in the inner cavity of the detection ring. The ends of the two arc-shaped rods are jointly connected to the open slot at one end of the swing lever. The middle part of the swing lever is connected to the inner cavity of the detection handle through a pin. One end of the hand pressure plate extends out of the detection handle, and the other end is located inside the detection handle. The other end of the swing lever is connected to the long hole inside the hand pressure plate through a pin. The hand pressure plate and the opening of the detection handle are connected through a positioning pin. The positioning pin and the long hole of the hand pressure plate are respectively located on the inner and outer sides of the hand pressure plate. A connecting rod is provided at the end of the arc-shaped rod. Long holes are respectively provided at both ends of the connecting rod along the length direction. One long hole is connected to the arc-shaped rod through a pin, and the other long hole is connected to the tightening mechanism. A pin connecting to the detection ring is provided between the two long holes of the connecting rod. The structure of the tightening mechanism is as follows: The bending point of an L-shaped swing rod is connected to the inner cavity of the detection ring through a rotating shaft. One end of a tension spring is connected to the vertical end of the swing rod, and the other end of the tension spring is connected to the fixed structure of the detection ring. And the vertical spherical end of the swing rod is located in the long hole of the connecting rod. A horizontal long hole is provided at the horizontal rod end of the swing rod. The top column straddles the horizontal end of the swing rod and is connected to the long hole of the swing rod through a pin connected to the top column. An ear piece is provided at the upper end of the top column. The top of the ear piece passes through the upper surface of the detection ring and is movably connected to the tightening roller. A threaded hole is provided on the detection ring near the outer end of the top column. A set screw is threadedly connected in the threaded hole, and the bottom surface of the set screw contacts the end of the horizontal rod of the swing rod.

[0007] The swing lever and the arc-shaped rod are connected through a circular lever. The circular lever is formed by connecting a circular part and a straight rod part. A universal ball head is provided at the outer end of the straight rod part of the circular lever, and the universal ball head is connected to the groove of the swing lever. Swing pins are symmetrically provided on the circular part of the circular lever. The swing pins are respectively connected to the arc-shaped rods on both sides. A positioning shaft is provided at the bottom of the circular part, and the positioning shaft is connected to the bottom surface of the inner cavity of the detection ring.

[0008] The measuring method using a bearing preload pad gauge includes the following steps:

[0009] 1) Alignment: Place the inspection ring on the marble platform with three reference pins as the reference. Reset the inspection head relative to the height reference, adjust the compression of the dial indicator probe, rotate the dial of the dial indicator to set the pointer to 0, and tighten the locking screw to complete the alignment of the measuring gauge.

[0010] 2) Hold the inspection handle with the right hand and press the hand pressure plate with your finger. Through the linkage of the tightening roller telescopic mechanism, drive the tightening roller to retract into the upper surface of the inspection ring.

[0011] 3) Use the left hand to move the floating handle upward. Through the linkage of the inspection head telescopic mechanism, drive the inspection head to retract into the upper surface of the inspection ring.

[0012] 4) Insert the inspection ring of the bearing preload pad measuring gauge into the reserved position of the spindle bearing preload pad, and then release the hand pressure plate and the floating handle to make the tightening roller located on the end face of the inner ring of the bearing.

[0013] 5) Rotate the inspection handle. The contact of the dial indicator is in a linkage state with the inspection head. The pointer of the dial indicator points to the value which is the difference from the alignment of the measuring gauge. Rotate the inspection gauge around the axis of the spindle for one week to detect, record the maximum and minimum values of the dial indicator, and calculate the average value as the mating value of the thickness of the bearing preload ring.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The mechanical structure for detecting the thickness of the preload pad of the NN series bearings adopted by the present invention has the same working nature as the widely used method of measuring the distance between the bearing end face and the reference end face of the spindle by using a set of gauge blocks. However, the overall structure is very compact, the operation is simple, and the working efficiency is increased by more than 20 times, which has unique advantages in the assembly of the spindle unit.

[0016] 2. The present invention consists of two sets of linkage mechanisms, namely the inspection head telescopic mechanism and the tightening roller telescopic mechanism, to achieve avoidance during the insertion process, and preloading and detection linkage during the working process, so as to achieve high-precision measurement.

[0017] 3. The measurement method of the bearing preload pad measuring gauge improves the detection efficiency on the premise of ensuring the detection accuracy, thereby improving the overall production efficiency of the product. Description of the Drawings

[0018] Figure 1 It is an axonometric view of the bearing preload pad measuring gauge.

[0019] Figure 2 It is a structural sectional view of the inspection head telescopic mechanism.

[0020] Figure 3 It is a top view of the tightening roller telescopic mechanism.

[0021] Figure 4 It is the front view of the tightening roller telescopic mechanism.

[0022] Figure 5 It is the connection schematic diagram of the circular lever.

[0023] Figure 6 It is the motion schematic diagram of the tightening roller telescopic mechanism.

[0024] Figure 7 It is the schematic diagram of the measuring range of the measuring gauge.

[0025] Figure 8 It is the schematic diagram of the application environment of the bearing preloading pad measuring gauge. Specific implementation manners

[0026] As Figures 1 to 5 shown, a bearing preloading pad measuring gauge includes a detection handle 41 and a detection ring 42. The detection ring 42 is semi-circular ring-shaped, and the detection handle 41 is located at the central axis of the outer surface of the semi-circular ring. A detection head 2 is provided on the top surface of the detection ring 42, and a dial base 8 is provided on the outer circumference of the detection ring 42. A detection head telescopic mechanism is provided inside the dial base 8. A dial indicator 10 is inserted into the dial base 8. The dial indicator 10 is fixed to the dial base through a locking bolt 9. The measuring head of the dial indicator 10 contacts one end of the detection head telescopic mechanism, and the other end of the detection head telescopic mechanism is connected to the detection head 2. Two tightening rollers 16 are provided on the upper surface of the detection ring 42. A hand pressure plate 29 is provided on the side surface of the detection handle 41. A tightening roller telescopic mechanism is provided inside the cavities of the detection handle 41 and the detection ring 42. One end of the tightening roller telescopic mechanism is connected to the tightening roller 16, and the other end is connected to the hand pressure plate 29. Three reference pins 24 evenly distributed in a circle are provided on the lower surface of the detection ring 42. After pressing the hand pressure plate 29, the tightening roller 16 retracts through the tightening roller telescopic mechanism; the detection head 2 retracts by triggering the detection head telescopic mechanism, so as to realize the avoidance during the insertion process of the detection ring 42.

[0027] As Figure 2As shown, the structure of the detection head telescopic mechanism is as follows: a lever seat 14 is fixedly connected to the bottom of the inner cavity of the detection ring 42. The middle part of the detection lever 3 located in the inner cavity of the detection ring 42 is connected to the lever seat 14 through a pin. One end of the detection lever 3 is connected to the detection head 2 through a pin, and the top of the detection head 2 extends out from the upper surface of the detection ring 42. The other end of the detection lever 3 is connected to a contact column 6 through a pin, and the contact column 6 is located in the vertical hole of the table base 8. A floating handle 7 that moves up and down is provided on the outer end surface of the table base 8. A horizontal threaded hole is provided on the contact column 6. After the floating handle 7 passes through the vertical long hole provided on the outer end surface of the table base 8, it is connected to the threaded hole of the contact column 6. A spring cap 4 is provided on the detection lever 3 near the contact column 6. A compression spring 5 is coaxially connected to the spring cap 4. The compression spring 5 is located in the groove of the table base 8, and the bottom is supported on the spring cap 4, and the top of the compression spring 5 is supported on the top surface of the groove. The measuring head of the dial indicator 10 contacts the upper surface of the contact column 6. When the floating handle 7 is lifted upward, the lever seat 14 overcomes the elastic force of the compression spring 5, causing the detection lever 3 to deflect, so as to drive the detection head 2 to retract into the detection ring 42.

[0028] As Figure 3 and Figure 4As shown in the figure, the tightening roller telescopic mechanism is composed of a loosening mechanism and a tightening mechanism. The structure of the loosening mechanism is as follows: arc-shaped rods 25 are symmetrically arranged in the inner cavity of the detection ring 42. The ends of the two arc-shaped rods 25 are jointly connected to one end of the swing lever 28. The middle part of the swing lever 28 is connected to the inner cavity of the detection handle 41 through a pin; one end of the hand pressure plate 29 extends out of the detection handle 41, and the other end is located inside the detection handle 41; the other end of the swing lever 28 is connected to the long slot inside the hand pressure plate 29 through a pin; the hand pressure plate 29 and the opening of the detection handle 41 are connected through a indexing pin 38. The indexing pin 38 and the long slot of the hand pressure plate 29 are respectively located on the inner and outer sides of the hand pressure plate 29; a connecting rod 31 is provided at the end of the arc-shaped rod 25. Both ends of the connecting rod 31 are provided with long slots along the length direction. One end of the long slot is connected to the arc-shaped rod 25 through a pin, and the other end of the long slot is connected to the tightening mechanism. A pin connecting to the detection ring 42 is provided between the two long slots of the connecting rod 31; The structure of the tightening mechanism is as follows: at the bending point of the L-shaped swing rod 17, the inner cavity of the detection ring 42 is connected through a rotating shaft. One end of the vertical end of the swing rod 17 is connected to one end of the tension spring 18, and the other end of the tension spring 18 is connected to the fixed structure of the detection ring 42. And the vertical end of the swing rod 17 is located in the long slot of the connecting rod 31; a horizontal long slot is provided at the horizontal rod end of the swing rod 17. The top column 15 straddles the horizontal end of the swing rod 17 and is connected to the long slot of the swing rod 17 through a pin connected to the top column 15. An ear plate is provided at the upper end of the top column 15. The top of the ear plate passes through the upper surface of the detection ring 42 and is movably connected to the tightening roller 16; a threaded hole is provided on the detection ring 42 near the outer end of the top column 15. A set screw 20 is threadedly connected in the threaded hole. The bottom surface of the set screw 20 contacts the end of the horizontal rod of the swing rod 17. As Figure 5 As shown in the figure, the swing lever 28 and the arc-shaped rod 25 are connected through a circular lever 27; the circular lever 27 is formed by connecting a circular part and a straight rod part. A universal ball head 45 is provided at the outer end of the straight rod part of the circular lever 27. The universal ball head 45 is connected to the groove of the swing lever 28; swing pins 46 are symmetrically provided on the circular part of the circular lever 27. The swing pins 46 are respectively connected to the arc-shaped rods 25 on both sides. A positioning shaft 47 is provided at the bottom of the circular part. The positioning shaft is connected to the bottom surface of the inner cavity of the detection ring 42.

[0029] Its action process is as Figures 3 to 6 As shown in the figure, press the hand pressure plate 29 of the measuring gauge detection handle 41, push the circular lever 27 to rotate through the swing lever 28. The two swing pins 46 on the circular lever 27 respectively push the arc-shaped rods 25 on both sides to perform mirror circular motions, and respectively drive the connecting rod 31 to deflect, pulling the swing rod 17 to overcome the tension of the tension spring 18, respectively driving the tightening rollers 16 at the corresponding positions to move downward, so that the height of the highest point of the roller 16 and the three round head nails 24 as the measurement reference plane is less than the distance between the end face of the NN series bearing and the reference end face of the main shaft.

[0030] As Figure 7As shown, the heights H and K at the upper and lower ends are the heights that need to be measured using the bearing preload pad measuring gauge of the present application. The method includes the following steps:

[0031] 1) Dial indicator calibration: The inspection ring 42 is placed on the marble platform with the three reference pins 24 as the reference. The inspection head 2 is reset relative to the height reference. Adjust the compression amount of the probe of the dial indicator 10, rotate the dial of the dial indicator to set the pointer to 0, and tighten the locking screw 9 to complete the alignment of the measuring gauge.

[0032] 2) Hold the inspection handle 41 with the right hand and press the hand pressure plate 29 with the finger. Through the linkage of the jacking roller telescopic mechanism, drive the jacking roller 16 to retract into the upper surface of the inspection ring 42.

[0033] 3) Use the left hand to lift the floating handle 7 upward. Through the linkage of the inspection head telescopic mechanism, drive the inspection head 2 to retract into the upper surface of the inspection ring 42.

[0034] 4) Insert the inspection ring 42 of the bearing preload pad measuring gauge into the reserved position of the preload pad, and then release the hand pressure plate 29 and the floating handle 7 so that the jacking roller 16 is located on the end face of the bearing inner ring.

[0035] 5) Insert the dial indicator 10 into the gauge block 8 and rotate the inspection handle 41. The contact of the dial indicator 10 and the inspection head 2 are in a linkage state. The pointer of the dial indicator points to the value that is the difference relative to the alignment of the measuring gauge. Rotate the inspection gauge around the axis of the main shaft for inspection, record the maximum and minimum values of the dial indicator, and calculate the average value as the fitting value of the thickness of the bearing preload ring, as Figure 8 shown.

Claims

1. A bearing preload pad measuring gauge, characterized in that: it includes a detection handle (41) and a detection ring (42). The detection ring (42) is semi-circular ring-shaped, and the detection handle (41) is located at the central axis of the outer surface of the semi-circular ring. A detection head (2) is provided on the top surface of the detection ring (42), and a dial gauge base (8) is provided on the outer circumference of the detection ring (42). A detection head telescopic mechanism is provided inside the dial gauge base (8). A dial indicator (10) is inserted into the dial gauge base (8), and the dial indicator (10) is fixed to the dial gauge base through a locking bolt (9). The measuring head of the dial indicator (10) contacts one end of the detection head telescopic mechanism, and the other end of the detection head telescopic mechanism is connected to the detection head (2). Two tightening rollers (16) are provided on the upper surface of the detection ring (42), a hand pressure plate (29) is provided on the side surface of the detection handle (41), and a tightening roller telescopic mechanism is provided in the inner cavities of the detection handle (41) and the detection ring (42). One end of the tightening roller telescopic mechanism is connected to the tightening roller (16), and the other end is connected to the hand pressure plate (29). Three reference pins (24) evenly distributed in a circle are provided on the lower surface of the detection ring (42); The structure of the detection head telescopic mechanism is that a lever seat (14) is fixedly connected to the bottom of the inner cavity of the detection ring (42). The middle part of a detection lever (3) located in the inner cavity of the detection ring (42) is connected to the lever seat (14) through a pin. One end of the detection lever (3) is connected to the detection head (2) through a pin, and the top of the detection head (2) extends out from the upper surface of the detection ring (42). The other end of the detection lever (3) is connected to a contact column (6) through a pin, and the contact column (6) is located in the vertical hole of the dial gauge base (8). A floating handle (7) that moves up and down is provided on the outer end surface of the dial gauge base (8). A horizontal threaded hole is provided on the contact column (6). After the floating handle (7) passes through the vertical long hole provided on the outer end surface of the dial gauge base (8), it is connected to the threaded hole of the contact column (6). A spring cap (4) is provided on the detection lever (3) near the contact column (6), and a compression spring (5) is coaxially connected to the spring cap (4). The compression spring (5) is located in the groove of the dial gauge base (8), and the bottom is supported on the spring cap (4), and the top of the compression spring (5) is supported on the top surface of the groove. The measuring head of the dial indicator (10) contacts the upper surface of the contact column (6); The described tightening roller telescopic mechanism consists of a loosening mechanism and a tightening mechanism. The structure of the loosening mechanism is as follows: Arc-shaped rods (25) are symmetrically arranged in the inner cavity of the detection ring (42). The ends of the two arc-shaped rods (25) are jointly connected to the open slot at one end of the swing lever (28). The middle of the swing lever (28) is connected to the inner cavity of the detection handle (41) through a pin; One end of the hand pressure plate (29) extends out of the detection handle (41), and the other end is located inside the detection handle (41); The other end of the swing lever (28) is connected to the long slot inside the hand pressure plate (29) through a pin; The hand pressure plate (29) is connected to the opening of the detection handle (41) through a positioning pin (38). The positioning pin (38) and the long slot of the hand pressure plate (29) are respectively located on the inner and outer sides of the hand pressure plate (29); A connecting rod (31) is provided at the end of the arc-shaped rod (25). Both ends of the connecting rod (31) are provided with long slots along the length direction. One end of the long slot is connected to the arc-shaped rod (25) through a pin, and the other end of the long slot is connected to the tightening mechanism. A pin connecting to the detection ring (42) is provided between the two long slots of the connecting rod (31); The structure of the tightening mechanism is as follows: The bending point of the L-shaped swing rod (17) is connected to the inner cavity of the detection ring (42) through a rotating shaft. One end of the vertical end of the swing rod (17) is connected to one end of the tension spring (18), and the other end of the tension spring (18) is connected to the fixed structure of the detection ring (42). And the vertical spherical end of the swing rod (17) is located in the long slot of the connecting rod (31); A horizontal long slot is provided at the horizontal rod end of the swing rod (17). The top column (15) straddles the horizontal end of the swing rod (17) and is connected to the long slot of the swing rod (17) through a pin connected to the top column (15). An ear plate is provided at the upper end of the top column (15). The top of the ear plate passes through the upper surface of the detection ring (42) and is movably connected to the tightening roller (16); A threaded hole is provided in the detection ring (42) near the outer end of the top column (15). A set screw (20) is threadedly connected in the threaded hole. The bottom surface of the set screw (20) contacts the end of the horizontal rod end of the swing rod (17).

2. The bearing preloading pad gauge according to claim 1, characterized in that: The swing lever (28) and the arc-shaped rod (25) are connected through a circular lever (27); The circular lever (27) is formed by connecting a circular part and a straight rod part. A universal ball head (45) is provided at the outer end of the straight rod part of the circular lever (27). The universal ball head (45) is connected to the groove of the swing lever (28); Swing pins (46) are symmetrically provided on the circular part of the circular lever (27). The swing pins (46) are respectively connected to the arc-shaped rods (25) on both sides. A positioning shaft (47) is provided at the bottom of the circular part. The positioning shaft is connected to the bottom surface of the inner cavity of the detection ring (42).

3. The measuring method using the bearing preloading pad gauge according to claim 1, characterized in that it includes the following steps: 1) Gauge alignment: The inspection ring (42) is placed on the marble platform with three reference pins (24) as the reference. The inspection head (2) is reset relative to the height reference, the compression amount of the dial indicator (10) probe is adjusted, the dial of the dial indicator is rotated to set the pointer to 0, and the locking bolt (9) is tightened to complete the gauge alignment of the measuring gauge; 2) Hold the inspection handle (41) with the right hand and press the hand pressure plate (29) with the finger. Through the linkage of the tightening roller telescopic mechanism, drive the tightening roller (16) to retract into the upper surface of the inspection ring (42); 3) Use the left hand to move the floating handle (7) upward. Through the linkage of the inspection head telescopic mechanism, drive the inspection head (2) to retract into the upper surface of the inspection ring (42); 4) Insert the inspection ring (42) of the bearing preload pad measuring gauge into the reserved position of the spindle bearing preload pad, and then release the hand pressure plate (29) and the floating handle (7) so that the tightening roller (16) is located on the end face of the inner ring of the bearing; 5) Rotate the inspection handle (41). The contact of the dial indicator (10) is in a linkage state with the inspection head (2). The pointer of the dial indicator points to the value that is the difference from the gauge alignment of the relative measuring gauge. The inspection gauge is rotated one week around the spindle axis for inspection, and the maximum and minimum values of the dial indicator are recorded. Calculate the average value as the fitting value of the bearing preload ring thickness.

Images